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Carbonyloxy radicals cyclizations

Acyl, carbonyloxy and related radical cyclizations are rapidly gaining prominence and appear to have excellent scope. Examples of 5-exo (bridged and fused), 6-endo (possibly through equilibration as in Scheme 21) and 6-exo cyclization106 have appeared. It is not presently clear whether the favorable ratios of cyclic to reduced products obtained with acyl radicals are due to inherendy high reactivity of acyl radicals towards cyclization or to low reactivity towards tin hydride (due to the relative weakness of the forming C—H bond). [Pg.798]

Bis(ortfe-phenylphenylcarbonyloxy)iodo]benzene 667 and biphenyl-2-carboxylic acid 668 can be converted into 6/7-benzo[f]chromen-6-one in excellent yield via generation and cyclization of their corresponding carbonyloxy radicals 669 (Scheme 159) < 1997J(P 1)787, 1999J(P1)1713>. [Pg.557]

See other pages where Carbonyloxy radicals cyclizations is mentioned: [Pg.103]    [Pg.103]   
See also in sourсe #XX -- [ Pg.798 ]

See also in sourсe #XX -- [ Pg.4 , Pg.798 ]

See also in sourсe #XX -- [ Pg.4 , Pg.798 ]



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Carbonyloxy radicals

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